Author: Albert Bertilsson
Date: 09:17:23 03/20/03
Hi everybody!
For those of you with a good memory you probably saw my posts about WAC, and
that I implemented check extensions and got a really nice improvement.
After playing some 150 games with about 10 lockups I also know that my
extensions aren't bug free =(.
In my stupidity I thought that all that needs to be done to get extensions work
is to add this:
First in Alpha-Beta:
if (CurrentPly >= MAXPLY) return Eval();
To avoid the possibility to extend and search forever.
And just before call AB again:
Loop through moves
{
...
depth_inc = 0;
if (InCheck()) depth_inc++;
res = AlphaBeta(depth - 1 + depth_inc, -beta, -alpha);
...
}
Am I missing something important here, because I've tried all the basic
debugging such checking for buffer overflows etc.
If it is of any help, I also tried NullMove pruning, also causing hang ups but
much more frequently (every fith position I tried).
/Regards Albert
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